
<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>
            <td :style="{ color: item.price >= 100 ? 'red' : '' }">
              {{ item.price }}
            </td>
            <td>{{ item.time | formatTime(item) }}</td>
            <td><a href="#" @click.prevent="addSn(item.id)">删除</a></td>
          </tr>

          <tr style="background-color: #eee" v-show="this.list.length !== 0">
            <td>统计:</td>
            <td colspan="2">总价钱为: {{ totalPrice }}</td>
            <td colspan="2">平均价: {{ avgPrice }}</td>
          </tr>
        </tbody>
        <!-- 底部的提示消息 -->

        <tfoot v-show="this.list.length === 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addFn">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
//引入moment包
import moment from "moment";

export default {
  data() {
    return {
      name: "",
      price: 0,
      list: JSON.parse(localStorage.getItem("lists")) || [
        {
          id: 100,
          name: "外套",
          price: 199,
          time: new Date("2010-08-12"),
        },
        {
          id: 101,
          name: "裤子",
          price: 34,
          time: new Date("2013-09-01"),
        },
        {
          id: 102,
          name: "鞋",
          price: 25.4,
          time: new Date("2018-11-22"),
        },
        {
          id: 103,
          name: "头发",
          price: 19900,
          time: new Date("2020-12-12"),
        },
      ],
    };
  },
  methods: {
    addFn() {
      //增加功能
      if (this.name === "" || this.price === 0) {
        alert("请填写完整");
        return;
      }
      this.list.push({
        id: +new Date(),
        name: this.name,
        price: this.price,
        time: new Date(),
      });
      (this.name = ""), (this.price = "");
    },
    addSn(id) {
      //删除功能
      //用素组filtter方法筛选出点击以外的数据新素组
      const arr = this.list.filter((item) => item.id !== id);
      this.list = arr;
    },
  },
  filters: {
    formatTime(time) {
      return moment(time).format("YYYY-MM-DD HH:mm:ss");
    },
  },
  computed: {
    //和
    totalPrice() {
      return this.list.reduce((prev, item) => prev + item.price, 0);
    },
    //均价
    avgPrice() {
      return (this.totalPrice / this.list.length).toFixed(2);
    },
  },
  watch: {
    list: {
      deep: true,
      handler() {
        localStorage.setItem("lists", JSON.stringify(this.list));
      },
    },
  },
};
</script>

<style>
.red {
  color: red;
}
</style>
